## 0.8. What's New in the Third Edition

There have been some big changes in Unix since we wrote the first edition in the early 1990s, and there's been a surprising number of changes since the second edition, released in the late 1990s. Well over half of the articles have been revised, and we've expanded our coverage of the so-called small Unix flavors: Linux, FreeBSD, Mac OS X's Darwin, and so on.

A major change to this edition was the addition of several new topics relevant to today's connected world, including protecting your machine from attack and several articles related to Internet protocols. We've also added chapters with coverage of two of the more popular languages used in Unix: Perl and Python.

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